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(ModeL) J. R. SCOTT. Sewing Machine.

NQ. 233,560. Ptented Oct. 19,1880.

WITNESSES ATTORNEYS.

N. PETERS, FHOYO-LITHOGRAPMERI. WASH UNITED STATES PATENT OFFICE.

JACOB R. SCOTT, OF NYAGK, NEW YORK, ASSIGNOR TO HIMSELF AND ANDREW H. JAOKMAN, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 233,560, dated October 19, 1880 Application filed March 5, 1880.

To all whom it may concern Be it known that I, J AOOB R. SCOTT, of N yack, in the county of Rockland and State of New York, have invented a new and useful Improvement in Sewing-Machines, of which the following is a specification.

My improvements relate to machines for sewing boots and shoeswherein the stroke of the needle is automatically varied by the variations in the thickness of the material, so that each stitch shall be drawn tight; and my invention consists, first, in devices operated by the presser-foot to limit the upward stroke of the needle, and, second, in a spring device attached upon the horn for retaining the looper in the proper position relative to the needle.

The needle-bar is hung on a rocking lever that is supported on a vertical standard which rests at its lower end on a beveled slide-block. The slide-block is connected by a crank-lever with the presser-foot, so that the slide-block is moved thereby to raise and lower the needlecarrying standard. The horn is fitted with a piece forming the bed, which piece contains the looper. Upon the horn is a flat spring bearing upon the looper to retain the same in proper position relative to the needle. These features will be more particularly described hereinafter, with reference to the accompanying drawings, wherein Figure 1 is a sectional side elevation of a sewing-machine embodying my improvements, and Fig. 2 is a sectional front view.

Similar letters of reference indicate corresponding parts.

A is the standard of the machine, carrying the plates a a, which support the mechanism. b is the driving-shaft. c is a vertical standard fitted in plates a, and carrying at its upper end a lever, (I, that is connected to the arm of an eccentric, e, on shaft 1). f is the needlebar, fitted to slide vertically in plates a, and connected by a rod, 9, with the outer end of lever d, and h is the presser bar, fitted to slide vertically in plates at, and forced downward by a spiral spring, h.

The standard 0 is fitted at its lower end with a collar, 0, having a beveled under side resting on a beveled or wedge-shaped block,

(Model.)

45, which rests on lower plate, a, and is slotted for the passage of standard 0.

Upon afixed standard is hung a bent lever, 70, the outer end of which is slotted to receive a pin or stud that projects from acollar, It, on the presser-bar it, while the inner end of lever 70 is connected to the block 13 byapin, i, which is attached to said block, and extends in the direction of the movement of the slide. The pin 1; passes freely through the lever 70 and is encircled by a spring, '1, that bears equally on opposite sides of the lever, whereby the lever is held by spring-pressure.

Upon the needle-bar f is a stud or projection, f, extending beneath the collar 70 of bar h, for the purpose of lifting the presser-bar h at the completion of the upward stroke of the needle. This movement is allowed by the spring Z, which yields to permit of the movement of lever k, the slide 1' being at that moment held in place by pressure of the standard c.

It will be seen that by the described construction the position of slide 2' is regulated by the presser-bar, which is raised and lowered according to the thickness of the material beneath it. If the material increases in thickness, the bar h is correspondingly raised, and the standard 0 lifted by slide i to the same extent, so that as the needle rises it draws the loop tightly, and draws a sufficient amount of thread from the spool to form the loop at the thicker portion or, if the thickness of the material decreases, the stroke of the needle is shortened by the reverse action, and only so much thread drawn off as is required.

B is the horn, fitted at its end with an apertured bed-piece, m, that is formed with the tail in and carries the looper n. The piece m is fitted to turn in the horn B, and the tail m, extending within the shoes, acts to retain the piece m and looper in the same position relative to the needle as the horn is turned. The looper a is fitted to rock on a pivot, as described in my previous application for Letters Patent filed December 19, 1879, and to hold the said looper upward in position for receiving the needle a flat spring, 0, is attached to the horn B and bears upon the under side of the looper.

This s'pring o is apertured to receive the rounded under side of the looper, and on' the descent of the needle the spring is depressed by the downward swinging movement of the looper until released by the rise of theneedle,

when the spring returns the looper to place.

Having thus described 1n y invention, I claim as new and desire to secure by Letters Patent 1. In sewing-machines, the combination, with the presser-bar h, provided with the collar 7c, the bent lever k, the pin 72, the spring 1,

the slide i, and the standard 0, of the needlebar f, provided with the stud or projection f, substantially as herein shown and described, and for the purpose set forth.

2. In sewing-machines, the combination, with the horn B, the revolving bed-piece m, and rocking looper n, of the spring 0, substantially as and for the purpose set forth.

JACOB R. SCOTT. Witnesses:

O. SEDGWIoK, GEO. D. WALKER. 

